2013

5.5

2012

6.1

1986

4.8

1997

6.7

1996

7.0

1995

3.5

1999

5.0

2007

6.0

1991

5.8

1993

6.0

2005

5.3

2000

7.3

1993

4.0

2016

6.8

1986

6.5

2011

0.0